Tim,
I think all belong to Elizabeth Moore who died Aug 1879 after Ellinor Elizabeth Robert married Ann Agnes Cowin in 1882. I believe I mentioned this info in note above.
Robert & Elizabeth had 9 children by my count

1851 Patrick
Kerrowdhoo
Robert Quayle head married 25 lead miner b Patrick
Elizabeth wife married 26 b Malew
Robert 2 months b Patrick

1861 Index
Patrick 5 65
Robert 35 b Patrick
Robert 10 Patrick
Elizabeth 36 b Malew
Thomas 4 b Patrick

1881
, 06-11, 052, QUAYLE, Robert, Castletown Rd, Head, Widower, 55, Engine Driver, Patrick
, 06-11, 052, , Castletown Rd, , , , In Mines
, 06-11, 052, QUAYLE, Sarah, Castletown Rd, Daughter, , 16, Housekeeper, Patrick
, 06-11, 052, , Castletown Rd, , , , For Father
, 06-11, 052, QUAYLE, Anna, Castletown Rd, Daughter, , 8, Scholar, Patrick
, 06-11, 052, QUAYLE, Ellinor Elizabeth, Castletown Rd, Daughter, , 6/12, , Patrick